Galvanomagnetic and thermoelectric properties of p-Bi2−xSbxTe3−ySey solid solutions at low temperatures (<220 K)

Abstract

The galvanomagnetic and thermoelectric properties of p -Bi 2− x Sb x Te 3− y Se y solid solutions ( x ≤1.2, y ≤0.09) are studied for various carrier concentrations. The degeneracy parameter β d governing the scattering processes in solid solutions was calculated in terms of the many-valley energy spectrum model. The data on the degeneracy parameter and the Seebeck coefficient α were used to calculate the effective scattering parameter r eff and the reduced Fermi level η. The parameter r eff was found to depend on the carrier concentration in the materials studied. The temperature dependences of the effective density-of-states mass m/m 0 and mobility μ 0 in samples with various carrier concentrations were determined.